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Hormetic growth of Pinus pseudostrobus seedlings exposed to low-dose gamma and X-ray irradiation
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Hormetic growth of Pinus pseudostrobus seedlings exposed to low-dose gamma and X-ray irradiation
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Hormetic growth of Pinus pseudostrobus seedlings exposed to low-dose gamma and X-ray irradiation
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Journal Article
Hormetic growth of Pinus pseudostrobus seedlings exposed to low-dose gamma and X-ray irradiation
2026
Overview
Mexico ranks among the countries with the highest deforestation rates, increasing the demand for high-quality forest seedlings of valuable species such as Pinus pseudostrobus Lindl., which face germination limitations due to seed dormancy and low viability. Ionising radiation has emerged as an alternative pregermination treatment capable of inducing adaptive responses in plants through hormesis. This study evaluated the effects of different doses of gamma radiation (60Co) and high-energy X-rays (linear accelerator, 6 MeV) on the germination, growth, and quality of P. pseudostrobus seedlings. A total of 1 440 seeds were irradiated per radiation source with 12 doses (0–25 Gy) and sown under nursery conditions in a completely randomised design. Germination parameters, morphological traits, photosynthetic pigment content, and quality indices were analysed. With both radiation sources, low doses (0.5–1.5 Gy) significantly enhanced germination, chlorophyll content, and seedling height and diameter, while doses above 15 Gy inhibited these responses. The LD50 (median lethal dose) was estimated at 20 Gy for gamma rays and 12 Gy for X-rays, whereas GR50 (median growth reduction dose) exceeded 45 Gy in both treatments. These findings demonstrate that low radiation doses elicit a beneficial hormetic effect in P.pseudostrobus, representing a viable biotechnological approach to improve seedling production and ecological reforestation efficiency.
